NixOS: use nixpkgs-flake to pin nixpkgs (NixOS/nix#7075)

nix/nixos/flake.nix

@@ -77,7 +77,7 @@
         uranus/configuration.nix
         hm2211.nixosModules.home-manager
         {
-          home-manager.users.delan = import ../nixpkgs/home.nix;
+          home-manager.users.delan = import ./home.nix;
 
           # use same nixpkgs as system, which has allowUnfree
           home-manager.useGlobalPkgs = true;
@@ -96,7 +96,7 @@
         nixos-hardware.nixosModules.lenovo-thinkpad-x1-extreme-gen2
         hm2405.nixosModules.home-manager
         {
-          home-manager.users.delan = import ../nixpkgs/home.nix;
+          home-manager.users.delan = import ./home.nix;
 
           # use same nixpkgs as system, which has allowUnfree
           home-manager.useGlobalPkgs = true;
@@ -114,7 +114,7 @@
         jupiter/configuration.nix
         hm.nixosModules.home-manager
         {
-          home-manager.users.delan = import ../nixpkgs/home.nix;
+          home-manager.users.delan = import ./home.nix;
 
           # use same nixpkgs as system, which has allowUnfree
           home-manager.useGlobalPkgs = true;

nix/nixos/lib/default.nix

@@ -66,14 +66,6 @@
         experimental-features = nix-command flakes
       '';
 
-      # pin nixpkgs flakeref to match our nixos config, to avoid constantly fetching unstable packages
-      # https://discourse.nixos.org/t/how-to-pin-nix-registry-nixpkgs-to-release-channel/14883/7
-      # TODO unwrap path in NixOS 22.11
-      nix.registry.nixpkgs.to = { type = "path"; path = "${pkgs.path}"; };
-
-      # pin nixpkgs channel to nixpkgs flakeref
-      nix.nixPath = ["nixpkgs=flake:nixpkgs"];
-
       console.keyMap = "us";
       i18n.defaultLocale = "en_AU.UTF-8";
       time.timeZone = "Australia/Perth";